Information disclosure in Cisco Spark Hybrid Calendar Service

1) Information disclosure

EUVDB-ID: #VU8918

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-12310

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists in the auto discovery phase of Cisco Spark Hybrid Calendar Service because an unencrypted HTTP request is made due to requirements for implementing the Hybrid Calendar service. A remote attacker can view sensitive information in the unencrypted headers of an HTTP method request and access sensitive customer data belonging to Office365 users, such as email and calendar events.

Mitigation

Update to version 1.0.4486.

Vulnerable software versions

Cisco Spark Hybrid Calendar Service: All versions

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_spark_hybrid_calendar_service:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171023-spark

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.